Image capturing lens system

ABSTRACT

An image capturing lens system includes a first lens having negative refractive power, a second lens having positive refractive power while having a convex object-side surface, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power with a concave object-side surface and a concave image-side surface, and a sixth lens having positive refractive power.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit under 35 USC 119(a) of Korean PatentApplication No. 10-2019-0000279 filed on Jan. 2, 2019, in the KoreanIntellectual Property Office, the entire disclosure of which isincorporated herein by reference for all purposes.

BACKGROUND 1. Field

The following description relates to an image capturing lens systemwhich may implement constant optical performance irrespective oftemperature variations in a surrounding environment.

2. Description of Background

Since a typical surveillance camera, mounted in a vehicle, captures onlya shape of a peripheral object, such a surveillance camera does not needto have high resolution. However, as an autonomous driving function hasbeen added to a vehicle, there is demand for a lens system appropriatefor a camera which may capture a distant object or may clearly capture anearby object.

SUMMARY

This Summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

In one general aspect, an image capturing lens system includes a firstlens having negative refractive power, a second lens having positiverefractive power while having a convex object-side surface, a third lenshaving positive refractive power, a fourth lens having positiverefractive power, a fifth lens having negative refractive power whilehaving a concave object-side surface and a concave image-side surface,and a sixth lens having positive refractive power. The first to sixthlenses are sequentially disposed from an object side of the imagecapturing lens system.

The image capturing lens system may include a stop disposed between thesecond lens and the third lens.

One of the third to sixth lenses may be formed of glass.

The one lens formed of glass may have positive refractive power.

Among the first to sixth lenses, four or more lenses may be formed ofplastic.

The image capturing lens system may satisfy Gf/f<2.0, where Gf is afocal length of the one lens formed of glass, and f is a focal length ofthe image capturing lens system.

The first lens may include a convex object-side surface.

The image capturing lens system may satisfy 0.7<BFL/S8S13, where BFL isa distance from an image-side surface of the sixth lens to an imagingplane, and S8S13 is a distance from an object-side surface of the fourthlens to an image-side surface of the sixth lens.

The image capturing lens system may satisfy D34<D23 and D45<D34, whereD23 is a distance from an image-side surface of the second lens to anobject-side surface of the third lens, D34 is a distance from animage-side surface of the third lens to the object-side surface of thefourth lens, and D45 is a distance from an image-side surface of thefourth lens to an object-side surface of the fifth lens.

In another general aspect, an image capturing lens system includes afirst lens, a second lens, a stop, a third lens, a fourth lens, a fifthlens, and a sixth lens sequentially disposed from an object side of theimage capturing lens system. The third lens or the fourth lens is formedof glass and the image capturing lens system satisfies 0.7<BFL/S8S13,where BFL is a distance from an image-side surface of the sixth lens toan imaging plane, and S8S13 is a distance from an object-side surface ofthe fourth lens to an image-side surface of the sixth lens.

The first lens may have negative refractive power.

The third lens and the fourth lens may have positive refractive power.

The image capturing lens system may satisfy f3/f<2.0 and f4/f<2.0, wheref is a focal length of the image capturing lens system, f3 is a focallength of the third lens, and f4 is a focal length of the fourth lens.

The second lens may include a convex image-side surface.

The image capturing lens system may satisfy D34<D23, where D23 is adistance from an image-side surface of the second lens to an object-sidesurface of the third lens, and D34 is a distance from an image-sidesurface of the third lens to the object-side surface of the fourth lens.

The image capturing lens system may satisfy D45<D34, where D34 is adistance from an image-side surface of the third lens to the object-sidesurface of the fourth lens, and D45 is a distance from an image-sidesurface of the fourth lens to an object-side surface of the fifth lens.

The third lens may include a concave object-side surface.

Other features and aspects will be apparent from the following detaileddescription, the drawings, and the claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a configuration of an image capturing lens systemaccording to a first example.

FIG. 2 illustrates aberration curves of the image capturing lens systemillustrated in FIG. 1 .

FIG. 3 illustrates MTF curves depending on temperature variations of theimage capturing lens system illustrated in FIG. 1 .

FIG. 4 illustrates a configuration of an image capturing lens systemaccording to a second example.

FIG. 5 illustrates aberration curves of the image capturing lens systemillustrated in FIG. 4 .

FIG. 6 illustrates MTF curves depending on temperature variations of theimage capturing lens system illustrated in FIG. 4 .

FIG. 7 illustrates a configuration of an image capturing lens systemaccording to a third example.

FIG. 8 illustrates aberration curves of the image capturing lens systemillustrated in FIG. 7 .

FIG. 9 illustrates MTF curves depending on temperature variations of theimage capturing lens system illustrated in FIG. 7 .

FIG. 10 illustrates a configuration of an image capturing lens systemaccording to a fourth example.

FIG. 11 illustrates aberration curves of the image capturing lens systemillustrated in FIG. 10 .

FIG. 12 illustrates MTF curves depending on temperature variations ofthe image capturing lens system illustrated in FIG. 10 .

FIG. 13 illustrates a configuration of an image capturing lens systemaccording to a fifth example.

FIG. 14 illustrates aberration curves of the image capturing lens systemillustrated in FIG. 13 .

FIG. 15 illustrates MTF curves depending on temperature variations ofthe image capturing lens system illustrated in FIG. 13 .

FIG. 16 illustrates a configuration of an image capturing lens systemaccording to a sixth example.

FIG. 17 illustrates aberration curves of the image capturing lens systemillustrated in FIG. 16 .

FIG. 18 illustrates MTF curves depending on temperature variations ofthe image capturing lens system illustrated in FIG. 16 .

FIG. 19 is a cross-sectional view of a camera module according to anexample.

Throughout the drawings and the detailed description, the same referencenumerals refer to the same elements. The drawings may not be to scale,and the relative size, proportions, and depiction of elements in thedrawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. However, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be apparent after an understanding of thedisclosure of this application. For example, the sequences of operationsdescribed herein are merely examples, and are not limited to those setforth herein, but may be changed as will be apparent after anunderstanding of the disclosure of this application, with the exceptionof operations necessarily occurring in a certain order. Also,descriptions of features that are known in the art may be omitted forincreased clarity and conciseness.

The features described herein may be embodied in different forms, andare not to be construed as being limited to the examples describedherein. Rather, the examples described herein have been provided merelyto illustrate some of the many possible ways of implementing themethods, apparatuses, and/or systems described herein that will beapparent after an understanding of the disclosure of this application.

Herein, it is noted that use of the term “may” with respect to anexample or embodiment, e.g., as to what an example or embodiment mayinclude or implement, means that at least one example or embodimentexists in which such a feature is included or implemented while allexamples and embodiments are not limited thereto.

Throughout the specification, when an element, such as a layer, region,or substrate, is described as being “on,” “connected to,” or “coupledto” another element, it may be directly “on,” “connected to,” or“coupled to” the other element, or there may be one or more otherelements intervening therebetween. In contrast, when an element isdescribed as being “directly on,” “directly connected to,” or “directlycoupled to” another element, there can be no other elements interveningtherebetween.

As used herein, the term “and/or” includes any one and any combinationof any two or more of the associated listed items.

Although terms such as “first,” “second,” and “third” may be used hereinto describe various members, components, regions, layers, or sections,these members, components, regions, layers, or sections are not to belimited by these terms. Rather, these terms are only used to distinguishone member, component, region, layer, or section from another member,component, region, layer, or section. Thus, a first member, component,region, layer, or section referred to in examples described herein mayalso be referred to as a second member, component, region, layer, orsection without departing from the teachings of the examples.

Spatially relative terms such as “above,” “upper,” “below,” and “lower”may be used herein for ease of description to describe one element'srelationship to another element as shown in the figures. Such spatiallyrelative terms are intended to encompass different orientations of thedevice in use or operation in addition to the orientation depicted inthe figures. For example, if the device in the figures is turned over,an element described as being “above” or “upper” relative to anotherelement will then be “below” or “lower” relative to the other element.Thus, the term “above” encompasses both the above and below orientationsdepending on the spatial orientation of the device. The device may alsobe oriented in other ways (for example, rotated 90 degrees or at otherorientations), and the spatially relative terms used herein are to beinterpreted accordingly.

The terminology used herein is for describing various examples only, andis not to be used to limit the disclosure. The articles “a,” “an,” and“the” are intended to include the plural forms as well, unless thecontext clearly indicates otherwise. The terms “comprises,” “includes,”and “has” specify the presence of stated features, numbers, operations,members, elements, and/or combinations thereof, but do not preclude thepresence or addition of one or more other features, numbers, operations,members, elements, and/or combinations thereof.

Due to manufacturing techniques and/or tolerances, variations of theshapes shown in the drawings may occur. Thus, the examples describedherein are not limited to the specific shapes shown in the drawings, butinclude changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in variousways as will be apparent after an understanding of the disclosure ofthis application. Further, although the examples described herein have avariety of configurations, other configurations are possible as will beapparent after an understanding of the disclosure of this application.

Hereinafter, examples of the present disclosure will be described asfollows with reference to the attached drawings.

In the examples, an entirety of a radius of curvature, a thickness, anda focal length of a lens are indicated in millimeters (mm). Further, athickness of a lens, and a gap between lenses are distances measuredbased on an optical axis of the lens.

In a description of a form of a lens, a surface of a lens being convexindicates that an optical axis region of a corresponding surface isconvex, while a surface of a lens being concave indicates that anoptical axis region of a corresponding surface is concave. Therefore, ina configuration in which a surface of a lens is described as beingconvex, an edge portion of the lens may be concave. In a similar manner,in a configuration in which a surface of a lens is described as beingconcave, an edge portion of the lens may be convex.

An image capturing lens system may include a plurality of lenses and astop. For example, the image capturing lens system may include a firstlens, a second lens, a stop, a third lens, a fourth lens, a fifth lens,and a sixth lens, sequentially disposed from an object side. In thedescriptions below, configurations of the lenses will be described.

The first lens may have refractive power. For example, the first lensmay have negative refractive power.

The first lens may have a convex surface. For example, the first lensmay have a convex object-side surface.

The first lens may be formed of a material having a constant refractiveindex in spite of temperature variations. For example, the first lensmay be formed of glass, but a material of the first lens is not limitedto glass.

The first lens may have a predetermined refractive index. For example,the first lens may have a refractive index of 1.7 or higher. When thefirst lens is formed of plastic, the first lens may have a refractiveindex lower than 1.7. The first lens may have an Abbe number greaterthan an Abbe number of the second lens. For example, the first lens mayhave an Abbe number of 45 or more.

The second lens may have refractive power. For example, the second lensmay have positive or negative refractive power.

The second lens may have a convex surface. For example, the second lensmay have a convex object-side surface or a convex image-side surface.

The second lens may include an aspherical surface. For example, bothsurfaces of the second lens may be aspherical. The second lens may beformed of a material having high light transmissivity and improvedworkability. For example, the second lens may be formed of plastic.

The second lens may have a predetermined refractive index. For example,the second lens may have a refractive index of 1.6 or more. The secondlens may have a predetermined Abbe number. For example, the second lensmay have an Abbe number lower than 23.

The stop is disposed between the second lens and the third lens. Thestop may adjust an intensity of light, incident on an imaging plane, toclearly capture an image, even in a high-luminance environment. Inaddition, the stop may adjust an intensity of light, incident on thethird to sixth lenses, to reduce thermal deformation of lenses caused bythe incident light.

The third lens may have refractive power. For example, the third lensmay have positive refractive power.

The third lens may have a convex surface. For example, the third lensmay have a convex image-side surface. The third lens may have an Abbenumber. As an example, the third lens may have an Abbe number of 50 ormore.

The fourth lens may have refractive power. For example, the fourth lensmay have positive refractive power.

The fourth lens may have at least one convex surface. For example, atleast one of an image-side surface and an object-side surface of thefourth lens may be convex. The fourth lens may have an Abbe number of 45or more.

One of the third and fourth lenses may be formed of a material having aconstant refractive index in spite of temperature variations. Forexample, the third lens may be formed of glass or the fourth lens may beformed of glass.

The fifth lens may have refractive power. For example, the fifth lensmay have negative refractive power.

The fifth lens may have at least one concave surface. For example, bothan object-side surface and an image-side surface of the fifth lens maybe concave.

The fifth lens may include at least one aspherical surface. For example,both the object-side surface and the image-side surface of the fifthlens may be aspherical. The fifth lens may be formed of a materialhaving high light transmissivity and improved workability. For example,the fifth lens may be formed of plastic. The fifth lens may have apredetermined refractive index. For example, the fifth lens may have arefractive index of 1.6 or more. The fifth lens may have an Abbe numberlower than an Abbe number of the fourth lens. For example, the fifthlens may have an Abbe number lower than 30.

The sixth lens may have refractive power. For example, the sixth lensmay have a positive refractive index.

The sixth lens may have a convex surface. For example, the sixth lensmay have a convex object-side surface.

The sixth lens may be formed of a material having high lighttransmissivity and improved workability. For example, the sixth lens maybe formed of plastic, but a material of the sixth lens is not limited tothe plastic. The sixth lens may include at least one aspherical surface.For example, both an object-side surface and an image-side surface ofthe sixth lens may be aspherical.

The sixth lens may have a predetermined refractive index. For example,the sixth lens may have a refractive index lower than 1.6.

The image capturing lens system may include one or more asphericallenses. For example, among the first to sixth lenses, four or morelenses may include aspherical surfaces. For example, one of the lenses,disposed on an object-side surface or an image-side surface of a stop,may be a spherical lens. The image capturing lens system, satisfying theabove condition, may be advantageous to implement a high resolution andto improve aberration. The aspherical surface may be represented byEquation (1) below.

$\begin{matrix}{Z = {\frac{{cr}^{2}}{1 + \sqrt{1 - {( {1 + k} )c^{2}r^{2}}}} + {Ar}^{4} + {Br}^{6} + {Cr}^{8} + {Dr}^{10} + {Er}^{12} + {Fr}^{14} + {Gr}^{16} + {Hr}^{18}}} & {{Equation}\mspace{14mu}(1)}\end{matrix}$

In Equation (1), “c” is an inverse of a radius of a curvature of arespective lens, “k” is a conic constant, “r” is a distance from acertain point on an aspherical surface to an optical axis, “A” to “H”are aspheric constants, and “Z” (or SAG) is a height from a certainpoint on an aspherical surface to an apex of the aspherical surface inan optical axis direction.

An image capturing lens system includes an image sensor. The imagesensor may be configured to implement high resolution. A surface of theimage sensor may form an imaging plane on which an image is formed.

The image capturing lens system includes a filter and a cover glass. Forexample, the filter may be disposed between the sixth lens and the imagesensor to filter components decreasing resolution, and the cover glassmay block foreign objects.

The image capturing lens system is configured to significantly reduce atemperature-dependent variation in focal length. For example, among thefirst to sixth lenses, four or more lenses may be formed of plastic, andthe other lenses may be formed of glass. One of the lenses, formed ofglass, is disposed between the stop and the imaging plane and haspositive refractive power. The image capturing lens system, satisfyingthe above condition, may have constant optical characteristics even at ahigh temperature or a low temperature, and reduction in manufacturingcost and weight lightening may be implemented.

The image capturing lens system is configured to satisfy at least one ofthe Conditional Expressions below.

Conditional Expression 1 Gf/f < 2.0 Conditional Expression 2 0.7 <BFL/S8S13 Conditional Expression 3 D34 < D23 Conditional Expression 4D45 < D34 Conditional Expression 5 f3/f < 2.0 Conditional Expression 6f4/f < 2.0 Conditional Expression 7 TL/f < 5.0

In the Conditional Expressions, “f” is a focal length of the imagecapturing lens system, “Gf” is a focal length of a lens, among the thirdto sixth lenses, formed of glass and disposed closest to an object side,“BFL” is a distance from the image-side surface of the sixth lens to theimaging plane, “S8S13” is a distance from the object-side surface of thefourth lens to the image-side surface of the sixth lens, “f2” is a focallength of the third lens, “f4” is a focal length of the fourth lens, and“TL” is a distance from the object-side surface of the first lens to theimaging plane.

In the descriptions below, an image capturing lens system according tovarious examples will be described.

An image capturing lens system 100 according to a first example will bedescribed with reference to FIG. 1 .

The image capturing lens system 100 includes a plurality of a pluralityof lenses, each having refractive power. For example, the imagecapturing lens system 100 includes a first lens 110, a second lens 120,a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens160.

The first lens 110 has negative refractive power, with a convexobject-side surface and a concave image-side surface. The second lens120 has positive refractive power, with a convex object-side surface anda convex image-side surface. The third lens 130 has positive refractivepower, with a concave object-side surface and a convex image-sidesurface. The fourth lens 140 has positive refractive power, with aconvex object-side surface and a convex image-side surface. The fifthlens 150 has negative refractive power, with a concave object-sidesurface and a concave image-side surface. The sixth lens 160 haspositive refractive power, with a convex object-side surface and aconvex image-side surface.

The image capturing lens system 100 includes a plurality of asphericallenses. For example, the second lens 120, the third lens 130, the fifthlens 150, and the sixth lens 160 include aspherical surfaces.

The image capturing lens system 100 includes at least one lens, formedof glass, to perform constant optical performance in spite oftemperature variations. In the example of FIG. 1 , the first lens 110and the fourth lens 140 are formed of glass, and the other lenses areformed of plastic.

The image capturing lens system 100 includes a stop ST. The stop ST isdisposed between the second lens 120 and the third lens 130. The imagecapturing lens system 100 includes a filter 170 and a cover glass 180.The filter 170 is disposed between the sixth lens 160 and an imagingplane 190 to block infrared light, and the cover glass 180 blocksforeign objects.

In the image capturing lens system 100, TL is 14.00 mm and f is 3.20 mm.

Table (1) lists lens characteristics of the image capturing lens system100, Table (2) lists aspherical constants, and Table (3) lists a focallength and a coefficient of linear thermal expansion (CTE) of each lens.FIG. 2 illustrates aberration curves of the image capturing lens system100, and FIG. 3 is a graph illustrating MTF characteristics of the imagecapturing lens system 100.

TABLE 1 Surface Radius of Thickness/ Refractive Abbe No. Note CurvatureDistance Index No. 1 First Lens 17.113 0.4 1.7725 49.62 2 2.167 0.908 3Second Lens 14.248 0.851 1.6612 20.35 4 −17.422 0.962 5 Stop Infinity0.225 6 Third Lens −4.909 1.431 1.5345 55.68 7 −3.273 0.1 8 Fourth Lens6.025 1.574 1.7433 49.4 9 −7.126 0.238 10 Fifth Lens −7.873 0.625 1.642822.4 11 3.532 0.1 12 Sixth Lens 3.482 1.876 1.5345 55.68 13 −6.445 0.514 Filter Infinity 0.4 1.5168 64.17 15 Infinity 3.263 16 Cover GlassInfinity 0.4 1.5168 64.17 17 Infinity 0.15 18 Imaging Plane Infinity−0.006

TABLE 2 Surface No. K A B C D 3 −0.984959 −0.004207 0.000373 −0.000353 04 18.400288 0.002266 −0.00016 0 0 6 5.680808 0.015847 0.001601 −0.0006820.000239 7 0.140001 0.006007 −0.000822 −0.000002 0 10 0.075623 0.001234−0.001957 0.000277 −0.000013 11 −0.961879 −0.023497 0.006347 −0.0008850.000048 12 −1.913323 −0.024659 0.007334 −0.000952 0.000044 13 −11.54384−0.002763 0.000054 0.000084 −0.00001

TABLE 3 Note Material Focal Length CTE(ppm) First Lens Glass −3.23428 8Second Lens Plastic 11.84906 66 Third Lens Plastic 14.007636 60 FourthLens Glass 4.606795 8 Fifth Lens Plastic −3.675012 71 Sixth Lens Plastic4.50912 60

Hereinafter, an image capturing lens system 200 according to a secondexample will be described with reference to FIG. 4 .

The image capturing lens system 200 includes a plurality of lenses, eachhaving refractive power. For example, the image capturing lens system200 includes a first lens 210, a second lens 220, a third lens 230, afourth lens 240, a fifth lens 250, and a sixth lens 260.

The first lens 210 has negative refractive power, with a convexobject-side surface and a concave image-side surface. The second lens220 has positive refractive power, with a convex object-side surface anda concave image-side surface. The third lens 230 has positive refractivepower, with a convex object-side surface and a convex image-sidesurface. The fourth lens 240 has positive refractive power, with aconvex object-side surface and a convex image-side surface. The fifthlens 250 has negative refractive power, with a concave object-sidesurface and a concave image-side surface. The sixth lens 260 haspositive refractive power, with a convex object-side surface and aconvex image-side surface.

The image capturing lens system 200 includes a plurality of asphericallenses. For example, the second lens 220, the third lens 230, the fourthlens 240, the fifth lens 250, and the sixth lens 260 include asphericalsurfaces.

The image capturing lens system 200 includes at least one lens, formedof glass, to perform constant optical performance in spite oftemperature variations. In the example of FIG. 4 , the first lens 210and the third lens 230 are formed of glass, and the other lenses areformed of plastic.

The image capturing lens system 200 includes a stop ST. The stop ST isdisposed between the second lens 220 and the third lens 230. The imagecapturing lens system 200 includes a filter 270 and a cover glass 280.The filter 270 is disposed between the sixth lens 260 and an imagingplane 290 to block infrared light, and the cover glass 280 blocksforeign objects.

In the image capturing lens system 200, TL is 14.00 mm and f is 3.20 mm.

Table (4) lists lens characteristics of the image capturing lens system200, Table (5) lists aspherical constants, and Table (6) lists a focallength and a coefficient of linear thermal expansion (CTE) of each lens.FIG. 5 illustrates aberration curves of the image capturing lens system200, and FIG. 6 is a graph illustrating MTF characteristics of the imagecapturing lens system 200.

TABLE 4 Surface Radius of Thickness/ Refractive Abbe No. Note CurvatureDistance Index No. 1 First Lens 56.928 0.44 1.7725 49.62 2 2.144 1.992 3Second Lens 6.165 0.973 1.6612 20.35 4 6.799 0.357 5 Stop Infinity−0.107 6 Third Lens 8.707 1.559 1.755 52.3 7 −3.864 1.302 8 Fourth Lens17.83 0.868 1.5348 55.72 9 −11.668 0.147 10 Fifth Lens −8.12 0.43 1.661220.35 11 5.421 0.368 12 Sixth Lens 3.671 1.547 1.5348 55.72 13 −10.6870.5 14 Filter Infinity 0.4 1.5168 64.17 15 Infinity 2.675 16 Cover GlassInfinity 0.4 1.5168 64.17 17 Infinity 0.15 18 Imaging Plane Infinity 0

TABLE 5 Surface No. K A B C 3 −1.91777 −0.00201 −0.00067 0.000043 40.92986 0.000943 −0.00042 0.000042 8 −54.8172 −0.00195 0.000545−1.90E−05 9 22.54924 −0.00936 0.00013 0.000039 10 6.951181 −0.00204−0.00157 — 11 −25.8172 0.005009 −8.20E−05 −3.60E−05 12 −8.66933 −0.003720.000858 −3.10E−05 13 1.441256 −0.00211 −0.00037 0.000066

TABLE 6 Note Material Focal Length CTE(ppm) First Lens Glass −2.879873 8Second Lens Plastic 61.251329 66 Third Lens Glass 3.727968 8 Fourth LensPlastic 13.26758 60 Fifth Lens Plastic −4.800192 66 Sixth Lens Plastic5.286187 60

An image capturing lens system 300 according to a third example will bedescribed with reference to FIG. 7 .

The image capturing lens system 300 includes a plurality of lenses, eachhaving refractive power. For example, the image capturing lens system300 includes a first lens 310, a second lens 320, a third lens 330, afourth lens 340, a fifth lens 350, and a sixth lens 360.

The first lens 310 has negative refractive power, with a convexobject-side surface and a concave image-side surface. The second lens320 has negative refractive power, with a concave object-side surfaceand a convex image-side surface. The third lens 330 has positiverefractive power, with a convex object-side surface and a conveximage-side surface. The fourth lens 340 has positive refractive power,with a convex object-side surface and a convex image-side surface. Thefifth lens 350 has negative refractive power, with a concave object-sidesurface and a concave image-side surface. The sixth lens 360 haspositive refractive power, with a convex object-side surface and aconcave image-side surface.

The image capturing lens system 300 includes a plurality of asphericallenses. For example, the first lens 310, the second lens 320, the fourthlens 340, the fifth lens 350, and the sixth lens 360 include asphericalsurfaces.

The image capturing lens system 300 includes a lens, formed of glass, toperform constant optical performance in spite of temperature variations.In the example of FIG. 7 , the third lens 330 is formed of glass, andthe other lenses are formed of plastic.

The image capturing lens system 300 includes a stop ST. The stop ST isdisposed between the second lens 320 and the third lens 330. The imagecapturing lens system 300 includes a filter 370 and a cover glass 380.The filter 370 is disposed between the sixth lens 360 and an imagingplane 390 to block infrared light, and the cover glass 380 blocksforeign objects.

In the image capturing lens system 300, TL is 14.00 mm and f is 3.244mm.

Table (7) lists lens characteristics of the image capturing lens system300, Table (8) lists aspherical constants, and Table (9) lists a focallength and a coefficient of linear thermal expansion (CTE) of each lens.FIG. 8 illustrates aberration curves of the image capturing lens system300, and FIG. 9 is a graph illustrating MTF characteristics of the imagecapturing lens system 300.

TABLE 7 Surface Radius of Thickness/ Refractive Abbe No. Note CurvatureDistance Index No. 1 First Lens 7.045 0.4 1.5348 55.72 2 1.938 1.725 3Second Lens −3.044 1.382 1.6612 20.35 4 −4.628 0.179 5 Stop Infinity−0.079 6 Third Lens 11.199 1.121 1.6968 55.41 7 −6.137 1.56 8 FourthLens 8.442 2.055 1.5348 55.72 9 −2.953 0.1 10 Fifth Lens −9.796 0.6531.6612 20.35 11 4.95 0.1 12 Sixth Lens 4.897 1.568 1.5348 55.72 1334.953 0.5 14 Filter Infinity 0.4 1.5168 64.17 15 Infinity 1.786 16Cover Glass Infinity 0.4 1.5168 64.17 17 Infinity 0.15 18 Imaging PlaneInfinity 0

TABLE 8 Surface No. K A B C D 1 −7.681703 0.002013 −0.000288 0.000025 —2 0.061406 −0.000388 0.000518 −0.000389 — 3 0.5422 0.004976 0.000134 — —4 −0.211763 0.002146 −0.000167 — — 8 −22.17865 0.007454 −0.0006450.000011 — 9 −2.361881 0.001728 −0.000264 0.000014 — 10 3.825378−0.00665 −0.000113 0.000164 −0.000011 11 −1.851574 −0.00174 −0.0000810.000118 −0.000009 12 −1.778214 0.00078 −0.000226 0.000012 — 13 0.96103−0.011395 0.001474 −0.00014  0.000005

TABLE 9 Note Material Focal Length CTE(ppm) First Lens Plastic −5.11875560 Second Lens Plastic −20.45832 66 Third Lens Glass 5.820223 8 FourthLens Plastic 4.347073 60 Fifth Lens Plastic −4.83182 66 Sixth LensPlastic 10.414383 60

An image capturing lens system 400 according to a fourth example will bedescribed with reference to FIG. 10 .

The image capturing lens system 400 includes a plurality of lenses, eachhaving refractive power. For example, the image capturing lens system400 includes a first lens 410, a second lens 420, a third lens 430, afourth lens 440, a fifth lens 450, and a sixth lens 460.

The first lens 410 has negative refractive power, with a convexobject-side surface and a concave image-side surface. The second lens420 has negative refractive power, with a concave object-side surfaceand a convex image-side surface. The third lens 430 has positiverefractive power, with a convex object-side surface and a conveximage-side surface. The fourth lens 440 has positive refractive power,with a convex object-side surface and a convex image-side surface. Thefifth lens 450 has negative refractive power, with a concave object-sidesurface and a concave image-side surface. The sixth lens 460 haspositive refractive power, with a convex object-side surface and aconvex image-side surface.

The image capturing lens system 400 includes a plurality of asphericallenses. For example, the first lens 410, the second lens 420, the fourthlens 440, the fifth lens 450, and the sixth lens 460 include asphericalsurfaces.

The image capturing lens system 400 includes a lens, formed of glass, toperform constant optical performance in spite of temperature variations.In the example of FIG. 10 , the third lens 430 is formed of glass, andthe other lenses are formed of plastic.

The image capturing lens system 400 includes a stop ST. The stop ST isdisposed between the second lens 420 and the third lens 430. The imagecapturing lens system 400 includes a filter 470 and a cover glass 480.The filter 470 is disposed between the sixth lens 460 and an imagingplane 490 to block infrared light, and the cover glass 480 blocksforeign objects.

In the image capturing lens system 400, TL is 14.00 mm and f is 3.23 mm.

Table (10) lists lens characteristics of the image capturing lens system400, Table (11) lists aspherical constants, and Table (12) lists a focallength and a coefficient of linear thermal expansion (CTE) of each lens.FIG. 11 illustrates aberration curves of the image capturing lens system400, and FIG. 12 is a graph illustrating MTF characteristics of theimage capturing lens system 400.

TABLE 10 Surface Radius of Thickness/ Refractive Abbe No. Note CurvatureDistance Index No. 1 First Lens 6.604 0.4 1.5348 55.72 2 1.878 1.625 3Second Lens −3.112 1.562 1.6612 20.35 4 −4.327 0.172 5 Stop Infinity−0.072 6 Third Lens 12.201 1.119 1.6968 55.41 7 −6.172 1.342 8 FourthLens 18.042 1.746 1.5348 55.72 9 −2.939 0.1 10 Fifth Lens −7.26 0.5931.6612 20.35 11 6.556 0.1 12 Sixth Lens 5.226 1.649 1.5348 55.72 13−38.415 0.5 14 Filter Infinity 0.4 1.5168 64.17 15 Infinity 0.1 16 CoverGlass Infinity 0.4 1.5168 64.17 17 Infinity 2.262 18 Imaging PlaneInfinity 0.002

TABLE 11 Surface No. K A B C 1 −7.681703 0.001478 −0.000152 0.000011 20.061406 −0.000781 0.000079 −0.000256 3 0.5422 0.004871 0.000294 0 4−0.211763 0.003197 −0.000192 0 8 −22.17865 0.006723 −0.000393 −0.0000169 −2.361881 0.000913 −0.000116 −0.000004 10 3.825378 −0.003579 0.0001220.000049 11 −1.851574 −0.000421 0.000531 −0.000031 12 −1.778214 0.0002510.000062 −0.000009 13 0.96103 −0.007494 0.00069 −0.000033

TABLE 12 Note Material Focal Length CTE(ppm) First Lens Plastic−5.036333 60 Second lens Plastic −34.20897 66 Third Lens Glass 6.0078 8Fourth Lens Plastic 4.846766 60 Fifth Lens Plastic −5.064417 66 SixthLens Plastic 8.679575 60

An image capturing lens system 500 according to a fifth example will bedescribed with reference to FIG. 13 .

The image capturing lens system 500 includes a plurality of lenses, eachhaving refractive power. For example, the image capturing lens system500 includes a first lens 510, a second lens 520, a third lens 530, afourth lens 540, a fifth lens 550, and a sixth lens 560.

The first lens 510 has negative refractive power, with a convexobject-side surface and a concave image-side surface. The second lens520 has positive refractive power, with a convex object-side surface anda concave image-side surface. The third lens 530 has positive refractivepower, with a concave object-side surface and a convex image-sidesurface. The fourth lens 540 has positive refractive power, with aconvex object-side surface and a convex image-side surface. The fifthlens 550 has negative refractive power, with a concave object-sidesurface and a concave image-side surface. The sixth lens 560 haspositive refractive power, with a convex object-side surface and aconvex image-side surface.

The image capturing lens system 500 includes a plurality of asphericallenses. For example, the first lens 510, the second lens 520, the fourthlens 540, the fifth lens 550, and the sixth lens 560 include asphericalsurfaces.

The image capturing lens system 500 includes a lens, formed of glass, toperform constant optical performance in spite of temperature variations.In the example of FIG. 13 , the third lens 530 is formed of glass, andthe other lenses are formed of plastic.

The image capturing lens system 500 includes a stop ST. The stop ST isdisposed between the second lens 520 and the third lens 530. The imagecapturing lens system 500 includes a filter 570 and a cover glass 580.The filter 570 is disposed between the sixth lens 560 and an imagingplane 590 to block infrared light, and the cover glass 580 blocksforeign objects.

In the image capturing lens system 500, TL is 14.00 mm and f is 3.20 mm.

Table (13) lists lens characteristics of the image capturing lens system500, Table (14) lists aspherical constants, and Table (15) lists a focallength and a coefficient of linear thermal expansion (CTE) of each lens.FIG. 14 illustrates aberration curves of the image capturing lens system500, and FIG. 15 is a graph illustrating MTF characteristics of theimage capturing lens system 500.

TABLE 13 Surface Radius of Thickness/ Refractive Abbe No. Note CurvatureDistance Index No. 1 First Lens 15.895 0.469 1.5348 55.72 2 1.803 1.6413 Second Lens 20 1 1.6612 20.35 4 100.599 0.16 5 Stop Infinity 0.1 6Third Lens −13.344 2.05 1.755 52.3 7 −3.323 0.1 8 Fourth Lens 12.0681.108 1.5348 55.72 9 −21.107 0.63 10 Fifth Lens −12.915 0.445 1.661220.35 11 5.266 0.1 12 Sixth Lens 3.565 1.623 1.5348 55.72 13 −7.933 0.514 Filter Infinity 0.4 1.5168 64.17 15 Infinity 0.1 16 Cover GlassInfinity 0.4 1.5168 64.17 17 Infinity 3.193 18 Imaging Plane Infinity−0.016

TABLE 14 Surface No. K A B C 1 0 −0.002362 0.000071 0 2 −0.070237−0.000027 −0.000937 0 3 −1.91777 0.000235 −0.000089 0.000274 4 0.929860.006087 0.001455 0.000122 8 −54.81723 −0.00522 0.000173 −0.000008 922.549235 −0.027239 0.002578 −0.000153 10 6.951181 −0.009539 0.000136 011 −25.81716 0.007946 −0.001059 0.000042 12 −8.669333 −0.001414 0.000379−0.000014 13 −24.61728 −0.005844 0.00017 0.00002

TABLE 15 Note Material Focal Length CTE(ppm) First Lens Plastic−3.830711 60 Second Lens Plastic 37.146079 66 Third Lens Glass 5.3613368 Fourth Lens Plastic 14.463942 60 Fifth Lens Plastic −5.540073 66 SixthLens Plastic 4.816803 60

An image capturing lens system 600 according to a sixth example will bedescribed with reference to FIG. 16 .

The image capturing lens system 600 includes a plurality of lenses, eachhaving refractive power. For example, the image capturing lens system600 includes a first lens 610, a second lens 620, a third lens 630, afourth lens 640, a fifth lens 650, and a sixth lens 660.

The first lens 610 has negative refractive power, with a concaveobject-side surface and a concave image-side surface. The second lens620 has positive refractive power, with a convex object-side surface anda concave image-side surface. The third lens 630 has positive refractivepower, with a concave object-side surface and a convex image-sidesurface. The fourth lens 640 has positive refractive power, with aconvex object-side surface and a convex image-side surface. The fifthlens 650 has negative refractive power, with a concave object-sidesurface and a concave image-side surface. The sixth lens 660 haspositive refractive power, with a convex object-side surface and aconvex image-side surface.

The image capturing lens system 600 includes a plurality of asphericallenses. For example, the first lens 610, the second lens 620, the fourthlens 640, the fifth lens 650, and the sixth lens 660 include asphericalsurfaces.

The image capturing lens system 600 includes a lens, formed of glass, toperform constant optical performance in spite of temperature variations.In the example of FIG. 16 , the third lens 630 is formed of glass, andthe other lenses are formed of plastic.

The image capturing lens system 600 includes a stop ST. The stop ST isdisposed between the second lens 620 and the third lens 630. The imagecapturing lens system 600 includes a filter 670 and a cover glass 680.The filter 670 is disposed between the sixth lens 660 and an imagingplane 690 to block infrared light, and the cover glass 680 blocksforeign objects.

In the image capturing lens system 600, TL is 14.00 mm and f is 3.20 mm.

Table (16) lists lens characteristics of the image capturing lens system600, Table (17) lists aspherical constants, and Table (18) lists a focallength and a coefficient of linear thermal expansion (CTE) of each lens.FIG. 17 illustrates aberration curves of the image capturing lens system600, and FIG. 18 is a graph illustrating MTF characteristics of theimage capturing lens system 600.

TABLE 16 Surface Radius of Thickness/ Refractive Abbe No. Note CurvatureDistance Index No. 1 First Lens −89.277 0.553 1.5348 55.72 2 1.889 1.5863 Second Lens 7.517 0.6 1.6612 20.35 4 17.903 0.43 5 Stop Infinity 0.1296 Third Lens −50.109 2.013 1.755 52.3 7 −3.995 0.336 8 Fourth Lens10.285 1.382 1.5348 55.72 9 −17.065 0.105 10 Fifth Lens −12.604 0.4961.6612 20.35 11 4.469 0.2 12 Sixth Lens 2.968 1.519 1.5348 55.72 13−9.847 0.5 14 Filter Infinity 0.4 1.5168 64.17 15 Infinity 3.2 16 CoverGlass Infinity 0.4 1.5168 64.17 17 Infinity 0.17 18 Imaging PlaneInfinity −0.02

TABLE 17 Surface No. K A B C 1 0 0.000011 −0.000032 0 2 −0.070237−0.001152 −0.00015 0 3 −1.91777 0.001147 −0.000301 0.000675 4 0.929860.004549 −0.00026 0.000653 8 −54.81723 0.002066 0.000217 −0.00002 922.549235 −0.027599 0.002957 −0.000119 10 6.951181 −0.01325 0.000595 011 −25.81716 −0.001702 0.001055 −0.000045 12 −8.669333 −0.0071710.001496 −0.000066 13 −52.60729 −0.003063 0.000116 0.000002

TABLE 18 Note Material Focal Length CTE(ppm) First Lens Plastic−3.436194 60 Second Lens Plastic 18.937894 66 Third Lens Glass 5.6172298 Fourth Lens Plastic 12.163183 60 Fifth Lens Plastic −4.876618 66 SixthLens Plastic 4.429409 60

In an image capturing lens system, focal lengths of first to sixthlengths may be determined to be within a predetermined range. Forexample, the focal length of the first lens may be determined in a rangefrom −6.2 mm to −1.8 mm, the focal length of the second lens may bedetermined to be 10 mm or more or −20 mm or less, the focal length ofthe third lens may be determined in a range from 2.7 mm to 16.0 mm, thefocal length of the fourth lens may be determined in a range from 3.6 mmto 14.0 mm, the focal length of the fifth lens may be determined in arange from −7.5 mm to −2.6 mm, and the focal length of the sixth lensmay be determined in a range from 3.4 mm to 13.0 mm.

The image capturing lens system satisfies at least one of theabove-described Conditional Expressions. Table (19) lists values ofConditional Expressions of image capturing lens systems according to therespective examples.

TABLE 19 First Second Third Fourth Fifth Sixth Example Example ExampleExample Example Example Gf/f 1.4396 1.1650 1.7942 1.8600 1.6754 1.7554BFL/S8S13 1.0666 1.2277 0.7230 0.8749 1.1718 1.2561 f3/f 4.3774 1.16501.7942 1.8600 1.6754 1.7554 f4/f 1.4396 4.1461 1.3400 1.5005 4.52003.8010 TL/f 4.3741 4.3753 4.3157 4.3344 4.3759 4.3747

A camera module 10 according to an example will be described withreference to FIG. 19 .

The camera module 10 includes one or more image capturing lens systemsaccording to the above-described examples (for example, an imagecapturing lens system, illustrated in FIG. 19 , has the configuration asthe image capturing lens system 100 according to the first example). Thecamera module 10 is configured such that optical performance of an imagecapturing lens system is constantly maintained irrespective oftemperature variations. For example, the camera module 10 includes alens barrel 20 and a housing 30 having different coefficients of linearthermal expansion. The coefficient of linear thermal expansion of thelens barrel 20 is 2×10⁻⁵ to 8×10⁻⁵, and the coefficient of linearthermal expansion of the housing 30 is 2×10⁻⁵ to 8×10⁻⁵. Although arange of the coefficient of linear thermal expansion of the lens barrel20 is the same as a range of the coefficient of linear thermal expansionof the housing 30, a camera module according to an example is selectedto have different coefficients of linear thermal expansion.

The camera module 10 is configured to separately accommodate a lensportion and the imaging plane (an image sensor) 190 of the imagecapturing lens system 100. For example, the lens portion of the imagecapturing lens system 100 is accommodated in the lens barrel 20, and theimaging plane 190 thereof is accommodated in the housing 30. The housing30 may further include an additional substrate 40 to support the imagingplane 196.

A length of the lens barrel 20 may be determined in consideration of avariation in back focal length (BFL) of the image capturing lens system100 depending on temperature variations. For example, a distance h1 froma bonding location B of the lens barrel 20 and the housing 30 to a lowerend of the lens barrel 20 may be determined in consideration of the BFLof the image capturing lens system 100, the coefficient of linearthermal expansion of the lens barrel 20, and the like. Alternatively,the distance h1 from the bonding location of the lens barrel 20 and thehousing 30 to the lower end of the lens barrel 20 may be determined by adifference between the coefficients of linear thermal expansion of thelens barrel 20 and the housing 30.

Similarly, the bonding location of the lens barrel 20 and the housing 30may be determined in consideration of a variation in the BFL of theimage capturing lens system 100 depending on temperature variations. Forexample, a distance h2 from the bonding location B to the imaging plane190 may be determined in consideration of the BFL of the image capturinglens system 100, the coefficient of linear thermal expansion of the lensbarrel 20, and the like. Alternatively, the distance h2 from the bondinglocation B to the imaging plane 190 may be determined by the differencebetween the coefficients of linear thermal expansion of the lens barrel20 and the housing 30.

As described above, an image capturing lens system according to theexamples may perform constant optical performance irrespective oftemperature variations of a surrounding environment.

While this disclosure includes specific examples, it will be apparentafter an understanding of the disclosure of this application thatvarious changes in form and details may be made in these exampleswithout departing from the spirit and scope of the claims and theirequivalents. The examples described herein are to be considered in adescriptive sense only, and not for purposes of limitation. Descriptionsof features or aspects in each example are to be considered as beingapplicable to similar features or aspects in other examples. Suitableresults may be achieved if the described techniques are performed in adifferent order, and/or if components in a described system,architecture, device, or circuit are combined in a different manner,and/or replaced or supplemented by other components or theirequivalents. Therefore, the scope of the disclosure is defined not bythe detailed description, but by the claims and their equivalents, andall variations within the scope of the claims and their equivalents areto be construed as being included in the disclosure.

What is claimed is:
 1. An image capturing lens system comprising: afirst lens having a negative refractive power; a second lens having apositive refractive power, and a convex object-side surface, and aconvex image-side surface; a third lens having a positive refractivepower and a concave object-side surface; a fourth lens having a positiverefractive power; a fifth lens having a negative refractive power, aconcave object-side surface, and a concave image-side surface at anoptical axis of the image capturing lens system; and a sixth lens havinga positive refractive power, wherein the first to sixth lenses aresequentially disposed in ascending numerical order from an object sideof the image capturing lens system toward an imaging plane of the imagecapturing lens system, and wherein the image capturing lens systemcomprises no more than six lenses with refractive power.
 2. The imagecapturing lens system of claim 1, further comprising a stop disposedbetween the second lens and the third lens.
 3. The image capturing lenssystem of claim 1, wherein one lens of the third to sixth lenses is madeof glass.
 4. The image capturing lens system of claim 3, wherein the onelens made of glass has a positive refractive power.
 5. The imagecapturing lens system of claim 4, wherein four or more lenses of thefirst to sixth lenses are made of plastic.
 6. The image capturing lenssystem of claim 4, wherein the following conditional expression issatisfied:Gf/f<2.0 where Gf is a focal length of the one lens formed of glass, andf is a focal length of the image capturing lens system.
 7. The imagecapturing lens system of claim 1, wherein the first lens has a convexobject-side surface.
 8. The image capturing lens system of claim 1,wherein the following conditional expression is satisfied:0.7<BFL/S8S13 where BFL is a distance from an image-side surface of thesixth lens to the imaging plane, and S8S13 is a distance from anobject-side surface of the fourth lens to the image-side surface of thesixth lens.
 9. The image capturing lens system of claim 8, wherein thefollowing conditional expressions are satisfied:D34<D23D45<D34, where D23 is a distance from an image-side surface of thesecond lens to an object-side surface of the third lens, D34 is adistance from an image-side surface of the third lens to the object-sidesurface of the fourth lens, and D45 is a distance from an image-sidesurface of the fourth lens to an object-side surface of the fifth lens.10. An image capturing lens system comprising: a first lens having arefractive power; a second lens having a refractive power and a concaveimage-side surface; a third lens having a refractive power and a concaveobject-side surface at an optical axis of the image capturing lenssystem; a fourth lens having a refractive power; a fifth lens having anegative refractive power and comprising a concave image-side surface atthe optical axis of the image capturing lens system; a sixth lens havinga refractive power; and a stop disposed between the second lens and thethird lens, wherein the first to sixth lenses are sequentially disposedin ascending numerical order from an object side of the image capturinglens system toward an imaging plane of the image capturing lens system,wherein the third lens or the fourth lens is made of glass, wherein thefollowing conditional expression is satisfied:0.7<BFL/S8S13 where BFL is a distance from an image-side surface of thesixth lens to an imaging plane, and S8S13 is a distance from anobject-side surface of the fourth lens to an image-side surface of thesixth lens, and wherein the first to sixth lenses are the only lenseshaving a refractive power in the image capturing lens system.
 11. Theimage capturing lens system of claim 10, wherein the first lens has anegative refractive power.
 12. The image capturing lens system of claim10, wherein the third lens and the fourth lens each have a positiverefractive power.
 13. The image capturing lens system of claim 10,wherein the following conditional expressions are satisfied:f3/f<2.0f4/f<2.0 where f is a focal length of the image capturing lens system,f3 is a focal length of the third lens, and f4 is a focal length of thefourth lens.
 14. The image capturing lens system of claim 10, whereinthe following conditional expression is satisfied:D34<D23 where D23 is a distance from an image-side surface of the secondlens to an object-side surface of the third lens, and D34 is a distancefrom an image-side surface of the third lens to the object-side surfaceof the fourth lens.
 15. The image capturing lens system of claim 10,wherein the following conditional expression is satisfied:D45<D34 where D34 is a distance from an image-side surface of the thirdlens to the object-side surface of the fourth lens, and D45 is adistance from an image-side surface of the fourth lens to an object-sidesurface of the fifth lens.